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WARNING in kvm_arch_vcpu_ioctl_run

Status: upstream: reported C repro on 2023/03/23 13:22
Bug presence: origin:lts-only
[Documentation on labels]
Reported-by: syzbot+b000b7d21f93fc69de32@syzkaller.appspotmail.com
First crash: 1094d, last: 5h03m
Fix commit to backport (bisect log) :
tree: upstream
commit 8e6ed96cdd5001c55fccc80a17f651741c1ca7d2
Author: Li RongQing <lirongqing@baidu.com>
Date: Fri Jan 6 04:06:25 2023 +0000

  KVM: x86: fire timer when it is migrated and expired, and in oneshot mode

[report pending]
  
Fix bisection: the issue occurs on the latest tested release (bisect log)
Crash: WARNING in kvm_arch_vcpu_ioctl_run (log)
Repro: C syz .config
  
▶ ▼ Discussions (1)
Title Replies (including bot) Last reply
Re: [v5.15] WARNING in kvm_arch_vcpu_ioctl_run 3 (3) 2023/08/28 15:23
▶ ▼ Bug presence (2)
Date Name Commit Repro Result
2023/05/18 linux-6.1.y (ToT) fa74641fb6b9 C [report] WARNING in kvm_arch_vcpu_ioctl_run
2023/05/18 upstream (ToT) 4d6d4c7f541d C Didn't crash
▶ ▼ Similar bugs (11)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream WARNING in kvm_arch_vcpu_ioctl_run (5) kvm-x86 -1 C error 343 925d 1012d 23/29 fixed on 2023/10/12 12:47
upstream WARNING in kvm_arch_vcpu_ioctl_run (4) kvm-x86 -1 C error 288 1017d 1101d 22/29 fixed on 2023/06/08 14:41
upstream WARNING in kvm_arch_vcpu_ioctl_run (2) kvm-x86 -1 C 61018 2973d 3062d 4/29 fixed on 2018/03/13 09:44
linux-6.6 WARNING in kvm_arch_vcpu_ioctl_run origin:upstream -1 C done 2 189d 189d 2/2 fixed on 2025/10/19 16:15
upstream WARNING in kvm_arch_vcpu_ioctl_run (6) kvm-x86 -1 C 117 166d 247d 29/29 fixed on 2025/10/29 21:02
upstream WARNING in kvm_arch_vcpu_ioctl_run -1 C 20284 3098d 3163d 3/29 fixed on 2017/09/26 01:38
linux-4.14 WARNING in kvm_arch_vcpu_ioctl_run -1 C inconclusive 71 1284d 2460d 0/1 upstream: reported C repro on 2019/06/25 23:07
upstream WARNING in kvm_arch_vcpu_ioctl_run (3) kvm-x86 -1 C done error 16157 1122d 2915d 22/29 fixed on 2023/02/24 13:50
linux-4.19 WARNING in kvm_arch_vcpu_ioctl_run -1 C error 116 1193d 2469d 0/1 upstream: reported C repro on 2019/06/17 10:07
linux-5.15 WARNING in kvm_arch_vcpu_ioctl_run origin:lts-only -1 C inconclusive 1632 10h42m 1077d 0/3 upstream: reported C repro on 2023/04/09 03:02
android-6-12 WARNING in kvm_arch_vcpu_ioctl_run origin:upstream -1 C 51 146d 247d 0/1 premoderation: reported C repro on 2025/07/17 01:43
▶ ▼ Fix bisection attempts (2)
Created Duration User Patch Repo Result
2024/01/23 15:07 3h52m (2) fix candidate upstream OK (1) job log
2023/04/29 07:09 43m bisect fix linux-6.1.y OK (0) job log log

Sample crash report:
L1TF CPU bug present and SMT on, data leak possible. See CVE-2018-3646 and https://www.kernel.org/doc/html/latest/admin-guide/hw-vuln/l1tf.html for details.
------------[ cut here ]------------
WARNING: CPU: 1 PID: 4432 at arch/x86/kvm/x86.c:11235 kvm_arch_vcpu_ioctl_run+0x1e9e/0x2390 arch/x86/kvm/x86.c:11235
Modules linked in:
CPU: 1 PID: 4432 Comm: syz.0.17 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:kvm_arch_vcpu_ioctl_run+0x1e9e/0x2390 arch/x86/kvm/x86.c:11235
Code: e8 07 47 c1 00 e9 4e ef ff ff 44 89 f9 80 e1 07 38 c1 0f 8c db e5 ff ff 4c 89 ff e8 cc 46 c1 00 e9 ce e5 ff ff e8 a2 15 71 00 <0f> 0b e9 da fc ff ff 44 89 f9 80 e1 07 80 c1 03 38 c1 0f 8c ae eb
RSP: 0018:ffffc90003457c48 EFLAGS: 00010293
RAX: ffffffff810fca2e RBX: ffff888019e60000 RCX: ffff88802c999dc0
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff888019e60000
RBP: ffff888025709000 R08: dffffc0000000000 R09: fffffbfff211906b
R10: fffffbfff211906b R11: 1ffffffff211906a R12: ffff888019e602f4
R13: ffff888019e600d8 R14: dffffc0000000000 R15: 0000000000000000
FS:  00005555838a2500(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055fb19aad0c0 CR3: 000000007701c000 CR4: 00000000003526e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 kvm_vcpu_ioctl+0x887/0xb80 virt/kvm/kvm_main.c:4122
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:870 [inline]
 __se_sys_ioctl+0xfa/0x170 fs/ioctl.c:856
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7ff828b8f749
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffd16abf0b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007ff828de5fa0 RCX: 00007ff828b8f749
RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000005
RBP: 00007ff828c13f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ff828de5fa0 R14: 00007ff828de5fa0 R15: 0000000000000003
 </TASK>

Crashes (1217):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/12/26 19:21 linux-6.1.y 50cbba13faa2 d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in kvm_arch_vcpu_ioctl_run
2025/09/15 20:12 linux-6.1.y 3db754f56897 e2beed91 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in kvm_arch_vcpu_ioctl_run
2025/08/23 01:06 linux-6.1.y 0bc96de781b4 bf27483f .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in kvm_arch_vcpu_ioctl_run
2025/07/15 16:44 linux-6.1.y f2198ea7eb3e 03fcfc4b .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in kvm_arch_vcpu_ioctl_run
2025/04/03 00:03 linux-6.1.y 8e60a714ba3b c799dfdd .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in kvm_arch_vcpu_ioctl_run
2024/12/23 03:08 linux-6.1.y 29f02ec58a94 b4fbdbd4 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in kvm_arch_vcpu_ioctl_run
2024/05/02 13:33 linux-6.1.y dcbc050cb0d3 3ba885bc .config console log report syz C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in kvm_arch_vcpu_ioctl_run
2024/01/21 20:27 linux-6.1.y 8fd7f4462453 9bd8dcda .config console log report syz C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in kvm_arch_vcpu_ioctl_run
2023/03/23 16:10 linux-6.1.y e3a87a10f259 f94b4a29 .config console log report syz C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in kvm_arch_vcpu_ioctl_run
2023/08/18 01:00 linux-6.1.y 6c44e13dc284 74b106b6 .config console log report syz C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in kvm_arch_vcpu_ioctl_run
2023/07/30 14:08 linux-6.1.y d2a6dc4eaf6d 92476829 .config console log report syz C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in kvm_arch_vcpu_ioctl_run
2023/06/04 12:06 linux-6.1.y d2869ace6eeb a4ae4f42 .config console log report syz C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/03/21 16:47 linux-6.1.y f2ddafa93a25 5b92003d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/03/21 13:37 linux-6.1.y f2ddafa93a25 5b92003d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/03/21 10:14 linux-6.1.y f2ddafa93a25 5b92003d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/03/20 22:08 linux-6.1.y f2ddafa93a25 ac6f1dff .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/03/20 22:08 linux-6.1.y f2ddafa93a25 ac6f1dff .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/03/20 01:13 linux-6.1.y f2ddafa93a25 bd6dcb30 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/03/19 23:50 linux-6.1.y f2ddafa93a25 bd6dcb30 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/03/19 19:51 linux-6.1.y f2ddafa93a25 bd6dcb30 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/03/19 18:03 linux-6.1.y f2ddafa93a25 bd6dcb30 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/03/18 22:14 linux-6.1.y f2ddafa93a25 0199f9a1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/03/18 17:48 linux-6.1.y f2ddafa93a25 0199f9a1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/03/18 04:35 linux-6.1.y f2ddafa93a25 c8810548 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/03/18 03:11 linux-6.1.y f2ddafa93a25 c8810548 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/03/17 14:55 linux-6.1.y f2ddafa93a25 c01bca74 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/03/12 21:25 linux-6.1.y f2ddafa93a25 4efadf07 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/03/11 10:37 linux-6.1.y f2ddafa93a25 86914af9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/03/10 20:52 linux-6.1.y f2ddafa93a25 4683d576 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/03/08 21:35 linux-6.1.y f2ddafa93a25 5cb44a80 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/03/08 09:25 linux-6.1.y f2ddafa93a25 5cb44a80 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/03/08 09:23 linux-6.1.y f2ddafa93a25 5cb44a80 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/03/08 07:41 linux-6.1.y f2ddafa93a25 5cb44a80 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/03/07 08:25 linux-6.1.y f2ddafa93a25 5cb44a80 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/03/07 07:09 linux-6.1.y f2ddafa93a25 5cb44a80 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/03/06 20:57 linux-6.1.y f2ddafa93a25 41d8037d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/03/06 17:53 linux-6.1.y f2ddafa93a25 41d8037d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/03/06 17:53 linux-6.1.y f2ddafa93a25 41d8037d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/03/06 05:58 linux-6.1.y f2ddafa93a25 31e9c887 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/03/05 22:35 linux-6.1.y f2ddafa93a25 d20b04c8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/03/03 20:53 linux-6.1.y 779f9571ac3e 4180d919 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/03/03 09:38 linux-6.1.y 779f9571ac3e 28b83e23 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/03/03 07:12 linux-6.1.y 779f9571ac3e 28b83e23 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/03/02 19:44 linux-6.1.y 779f9571ac3e b9dd6534 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/03/02 19:43 linux-6.1.y 779f9571ac3e b9dd6534 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/03/01 17:36 linux-6.1.y 779f9571ac3e 43249bac .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/03/01 16:32 linux-6.1.y 779f9571ac3e 43249bac .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/02/28 18:08 linux-6.1.y 779f9571ac3e 43249bac .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/02/28 11:29 linux-6.1.y 779f9571ac3e 43249bac .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/02/28 09:59 linux-6.1.y 779f9571ac3e 43249bac .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/02/27 04:51 linux-6.1.y 779f9571ac3e a2f13f71 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/02/26 22:12 linux-6.1.y 779f9571ac3e ffa54287 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/02/26 18:30 linux-6.1.y 779f9571ac3e ffa54287 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/02/25 22:42 linux-6.1.y 779f9571ac3e 94a9671e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in kvm_arch_vcpu_ioctl_run
2023/03/23 13:22 linux-6.1.y e3a87a10f259 f94b4a29 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in kvm_arch_vcpu_ioctl_run
* Struck through repros no longer work on HEAD.